I've had an idea I'm curious about.

I have these sites :

http://www.roman365.com
http://www.roman365.info

I'm experimenting at the moment with a great cms called e107 - version 7. It has the ability to wrap other scripts. Its set up on roman365.com

e107 is powered by a mysql db and what guests/user groups can see can be controlled sitewide via cookies and another method I forget right now.

What I'm thinking would be to use glinks as a directory within a site fronted by e107, how hard would it be to tie together a user login so one login does both scripts? Not too worried about tying anything else in between the two, just the logged in status.

Any advice or suggestions would be greatly appreciated.